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Abstract

In electro-erosion printing, the recording medium is generally comprised of a substrate, a thin conductive layer, such as Al, a base layer located between the substrate and the Al layer, and an overlayer on the Al layer. The base layer and the overlayer help to prevent scratching of the Al layer in areas where it is not to be eroded. However, high local temperatures produced during the printing process may cause softening and abrasion of some of the base layer compositions, especially in the case where thermally labile and low Tg (glass transition temperature) polymers are used. This can cause fouling of the printhead and consequent degradation of print quality.

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United States

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English (United States)

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This is the abbreviated version, containing approximately
54% of the total text.

Improved Baselayers in Electro-Erosion Recording

In
electro-erosion printing, the recording medium is
generally comprised of a substrate, a thin conductive layer, such as
Al, a base layer located between the substrate and the Al layer, and
an overlayer on the Al layer. The base
layer and the overlayer help
to prevent scratching of the Al layer in areas where it is not to be
eroded. However, high local temperatures
produced during the
printing process may cause softening and abrasion of some of the base
layer compositions, especially in the case where thermally labile and
low Tg (glass transition temperature) polymers are used. This can
cause fouling of the printhead and consequent degradation of print
quality.

For improved
base layer compositions, the application of
polyorganosiloxanes generated primarily from trialkoxysilanes are
used to form highly crosslinked three-dimensional network, such as
the "glass resins" available from Owens-Illinois. These are superior
binders for inorganic roughening agents such as SiO2, TiO2, Zno,
CaCo3 or boron nitride in base coat compositions for electro-erosion
recording media. These materials have
high thermal and oxidative
stability and high softening temperature, and, therefore, provide
coatings with reduced blocking, fouling and baking problems. The
improved thermal stability of such siloxane polymers is due to the
high bond strength of the Si-O bond and the lack of C-C linkages in
the main polymer chain....